WILL 1866RAM WORK IN BOARD DESIGNED FOR 1333?

I am on first build and I bought lowest budget stuff I could thats should be compatible,EXCEPT I made mistake of getting ddr3 1866 instead of recommended ddr3 1333.I have A8-3870k with an Asrock A75 FM1 PRO4.Will this work or cause stability problems? PRO4-MVP uses 1866.Should I RMA it and get different either board or ram?THANKS

Yup, it will work.

You'd need to manually change settings if you wanted it to actually run at 1866.

This my first build so im trying to minimize problems before they cost me, as ive read of people having probs with many things like mobos doa or ram sticks,etc.it could make it really hard for a noob like me to diagnose some of these things.Thanx IMOG

If you look here, you can see what memory speeds your MB should support:
http://www.newegg.com/Product/Product.aspx?Item=N82E16813157258

Good input Grape, thanks for adding that. Welcome to OCF!